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authorSongjun Wu <songjun.wu@atmel.com>2016-01-18 11:14:44 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-03-03 15:07:24 -0800
commitf4fa3d6f9e84d5009d78c732a0a81251b8bfe0b4 (patch)
treeada7e175698d78cb79f74034c57c548a5825a911 /drivers/dma
parent7ed338d4a9f58d88cd9fda055425bc6e0b8f3865 (diff)
dmaengine: at_xdmac: fix resume for cyclic transfers
commit 611dcadb01c89d1d3521450c05a4ded332e5a32d upstream. When having cyclic transfers, the channel was paused when performing suspend but was not correctly resumed. Signed-off-by: Songjun Wu <songjun.wu@atmel.com> Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com> Fixes: e1f7c9eee707 ("dmaengine: at_xdmac: creation of the atmel eXtended DMA Controller driver") Signed-off-by: Vinod Koul <vinod.koul@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/at_xdmac.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c
index 370c661c7d7b..fa00f3a186da 100644
--- a/drivers/dma/at_xdmac.c
+++ b/drivers/dma/at_xdmac.c
@@ -1688,6 +1688,7 @@ static int at_xdmac_device_terminate_all(struct dma_chan *chan)
list_for_each_entry_safe(desc, _desc, &atchan->xfers_list, xfer_node)
at_xdmac_remove_xfer(atchan, desc);
+ clear_bit(AT_XDMAC_CHAN_IS_PAUSED, &atchan->status);
clear_bit(AT_XDMAC_CHAN_IS_CYCLIC, &atchan->status);
spin_unlock_irqrestore(&atchan->lock, flags);
@@ -1820,6 +1821,8 @@ static int atmel_xdmac_resume(struct device *dev)
atchan = to_at_xdmac_chan(chan);
at_xdmac_chan_write(atchan, AT_XDMAC_CC, atchan->save_cc);
if (at_xdmac_chan_is_cyclic(atchan)) {
+ if (at_xdmac_chan_is_paused(atchan))
+ at_xdmac_device_resume(chan);
at_xdmac_chan_write(atchan, AT_XDMAC_CNDA, atchan->save_cnda);
at_xdmac_chan_write(atchan, AT_XDMAC_CNDC, atchan->save_cndc);
at_xdmac_chan_write(atchan, AT_XDMAC_CIE, atchan->save_cim);